HALDIMAND COUNTY, Ont. - A Caledonia woman narrowly escaped injury after her windshield was shattered by a rock thrown from a highway overpass.

Two vehicles travelling north on the Highway 6 bypass early Saturday morning were approaching the Stirling Road bridge when a volleyball sized object came crashing down on them.

It is alleged that two teens were seen standing on the overpass, and one of them was seen throwing the aggregate onto the highway.

The driver of the first car, a 33-year-old Nanticoke man was able to swerve and miss the rock.

The rock then bounced on to the hood of the second vehicle and shattered the windshield.

The 44-year-old female driver was showered with fragments of glass, but was not injured.

The man who successfully avoided the rock stopped his vehicle and ran after the pair but was unable to apprehend them.

Anyone with information about the suspects is asked to contact the Haldimand OPP or Crimestoppers.